TIL311
HEXADECIMAL DISPLAY WITH LOGIC
TAOS058
−
OCTOBER 2007
Terminal Functions
TERMINAL
NAME
Blanking Input
NO.
8
TYPE
I
DESCRIPTION
Blanking Input. When high, the display is blanked regardless of the levels of the other inputs. When low,
a character is displayed as determined by the data in the latches. The blanking input may be pulsed for
intensity modulation.
Latch Data Input A. Data on this input is entered into the latch when the Latch Strobe Input is low. The
binary weight of this input is 1.
Latch Data Input B. Data on this input is entered into the latch when the Latch Strobe Input is low. The
binary weight of this input is 2.
Latch Data Input C. Data on this input is entered into the latch when the Latch Strobe Input is low. The
binary weight of this input is 4.
Latch Data Input D. Data on this input is entered into the latch when the Latch Strobe Input is low. The
binary weight of this input is 8.
Common Ground. This is the negative terminal for all logic and LED currents except for the decimal points.
LED Supply (V
CC
). This terminal permits the user to save on regulated V
CC
current by using a separate
LED supply, or it may be externally connected to the logic supply (V
CC
).
Left Decimal Point Cathode. This LED is not connected to the logic chip. If a decimal point is used, an
external resistor or other current-limiting mechanism must be connected in series with it.
Logic Supply (V
CC
). Separate V
CC
terminal for the logic chip.
There is no pin at this location.
Right Decimal Point Cathode. This LED is not connected to the logic chip. If a decimal point is used, an
external resistor or other current-limiting mechanism must be connected in series with it.
I
Latch Strobe Input. When low, the data in the latches follow the data on the latch data inputs. When high,
the data in the latches does not change. If the display is blanked and then restored while this input is high,
the previously displayed character will again be displayed.
Data Input A
Data Input B
Data Input C
Data Input D
Ground
LED Supply
Left Decimal
Logic Supply
omitted
Right Decimal
Strobe Input
3
2
13
12
7
1
4
14
6, 9, 11
10
5
I
I
I
I
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, logic, V
CC
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Supply voltage, LED, V
CC
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage (pins 2, 3, 5, 8, 12, 13), V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Decimal point current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Operating case temperature range, T
C
(see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 85°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−25°C
to 85°C
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltages are with respect to the Common Ground terminal.
2. Case temperature is the surface temperature of the plastic measured directly over the integrated circuit. Forced-air cooling may be
required to maintain this temperature.
Recommended Operating Conditions
MIN
Supply voltage, logic, V
CC
Supply voltage, LED, V
LED
Decimal point current, I
F(DP)
Pulse duration, t
w
, latch strobe
Setup time, t
su
Hold time, t
h
4.5
4
40
50
40
NOM
5
5
5
MAX
5.5
5.5
UNIT
V
V
mA
ns
ns
ns
Copyright
E
2007, TAOS Inc.
r
r
The
LUMENOLOGY
r
Company
2
www.taosinc.com
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
